Eaton 9355 15kVA UPS – Three Phase Input

Eaton 9355 15kVA UPS

The Eaton 9355 15kVA UPS  provides premium double-conversion backup power and scalable battery runtimes for IT and electrical engineering infrastructure in corporate, healthcare, banking and industrial applications. Packing maximum battery runtime into a very small footprint, the 9355 UPS is a complete three-phase power protection solution. The 9355 can be equipped with an integrated, customizable power distribution module that includes a maintenance bypass switch.

  • Power rating: 15kVA / 13.5kW
  • Form factor: Small-footprint tower, black
  • Topology: Double Conversion Online
  • Battery backup: 5 minutes typical, extendable up to 113 minutes

For questions or quotations please contact us via Chat, Phone or email at 

Product description

Premium power protection

With the Eaton 9355 15kVA UPS, data center managers can safely eliminate the effects of electrical line disturbances and guard the integrity of their systems and equipment. The 9355 is a true double-conversion, three-phase system that can be used to prevent loss of valuable electronic information and minimize equipment downtime.

  • The 9355 continually monitors incoming electrical power and removes the surges, spikes, sags, and other irregularities that are inherent in commercial utility power
  • Working with a building’s electrical system, the 9355 supplies the clean, consistent power required by sensitive electronic equipment for reliable operation
  • During brownouts, blackouts, and other power interruptions, internal batteries provide emergency power to safeguard operation.

This innovative design delivers one of the industry’s best combinations of high efficiency, low input current distortion and highest power factor, while conserving valuable space and offering the most cost-effective, highest performance option available today.

  • Double-conversion topology provides complete power protection, isolating valuable IT equipment from all eaton-nine-power-problems
  • Industry leading power density, providing up to 20 percent more power capacity in a compact tower design including batteries
  • Up to 350 percent more standard runtime
  • Up to a 74 percent footprint reduction and up to an 83 percent total size reduction
  • Flexible on-board power distribution modules (PDMs) allow for hardwired output or up to 15 different output receptacle options, reducing installation and site preparation expenses receptacle options, reducing installation and site preparation expenses
  • Plug-and-play rack Enclosure power distribution with the 9355 on-board PDU
  • Inherently scalable from 10–15 and 20–30 kVA, allowing you to pay as you grow or increase capacity with no additional hardware purchases or installation concerns
  • Eaton’s patented Hot Sync paralleling technology allows for wireless paralleling in the event of communications failure, providing the industry’s only truly redundant paralleling technology
  • Includes rear-mounted bypass switch
  • Includes on-site 5×8 startup and operator training by Eaton field technician (Eaton startup is required all 9355 UPS systems)
  • Includes one year of PredictPulse remote monitoring service (requires connectivity parts and self installation)

Industry-leading scalability and redundancy

Today’s critical applications require redundancy for ultimate reliability—and the 9355 delivers. Eaton’s innovative Hot Sync technology and optional maintenance bypass parallel tie cabinet work together with the 9355 to provide an advanced, cost-effective UPS paralleling system.

The patented Hot Sync technology enables system load sharing, allowing any UPS module in the system to serve as a backup for any other module. Hot Sync’s wireless paralleling capability also ensures system stability in the event of a communications failure.

Using a wall-mounted maintenance bypass parallel tie cabinet, data center managers can easily parallel up to four 9355 UPSs for either redundancy or capacity. UPSs can be quickly added to the pre-installed parallel tie cabinet and brought online in minutes, and individual UPSs can be isolated and swapped out for maintenance significantly
reducing installation and maintenance expenses.

Most other paralleling systems on the market use a top-down configuration in which the master fails when any subsidiary module fails. With Eaton’s unique approach, each UPS is independent, yet synchronized with the others to prevent any single point of failure and help eliminate costly downtime.

Additional paralleling benefits include:

  • Scalability, from 10 to 120 kVA using one parallel tie cabinet
  • N+3, N+2 or N+1 redundancy, from 10 to 90 kVA in a compact footprint—often in a smaller footprint than a single large UPS
  • Redundant battery systems, with each parallel UPS containing its own internal batteries
Double Conversion Online UPS

Double Conversion Technology

Double Conversion Topology

The Eaton 9355 15kVA UPS utilizes the Double Conversion Online UPS topology.  This  provides the ultimate in clean and stable electrical power for critical applications.  Incoming AC power is fed to the UPS’ rectifier converting it from AC to DC power. The converted DC power routes to a battery charging circuit and to the inverter for conversion back to AC power. The resulting “double converted” electrical power is pure sine wave output providing near perfect electrical power for connected equipment.

To ensure 7/24 up time the double conversion UPS topology utilizes a static “bypass switch” within its circuity design. If the Eaton 9355 detects a system failure, audible alarms will sound as the bypass switch is engages. This routes power around the failed UPS and ensures critical load power to target equipment.  This very important feature allows for 100% up time for critical equipment during repair.

In the event of total power failure, the UPS will power off the rectifier when the loss of power is detected. The UPS’ internal backup batteries will continue to supply DC power to the inverter. There is no transfer time as the transition to battery power is instantaneous. This feature provides true uninterruptible power to mission critical equipment.

Technical Specifications


9355 15 kVA with 32-Battery (2-high) KA1511100000010
9355 15 kVA with 32-Battery (2-high) KA1511200000010
9355 15 kVA with 32-Battery and input isolation transformer (3-high) KA1513400000010
9355 15 kVA with 32-Battery and input isolation transformer (3-high) KA1513600000010
9355 15 kVA with 64-Battery (3-high) KA1512100000010
9355 15 kVA with 64-Battery (3-high) KA1512200000010

Rated Power Capacity (Apparent/Active)

15kVA / 13.5kW

Voltage/frequency range

208V/120V or 220V/127V three-phase 400V models also available

Efficiency (Maximum%)

91%, typical

Overload Capacity

101 110% for 10 minutes 111 125% for 60 seconds 126 149% for 5 seconds>150% for 300 milliseconds

Max charging (adjustable)

9355 (10 – 15 kVA): Default is 3.4A per battery string. Charger current is configurable from 0.5A to 25A per string with an overall maximum of 34A (limited by input current)

Battery Module

9 Ah sealed, valve-regulated lead acid (VRLA), maintenance-free, minimum 3-year float service life at 25°C (77°F), voltage 192 Vdc (96 cells per string)

Dimensions & Weight

2-High UPS – 32.2" x 12" x 33.5" (81 x 30 x 85 cm) 381 lb (173 kg)
3-High UPS-32 – 47.8" x 12" x 33.5" (121.5 x 30 x 85 cm) 587 lb (266 kg)
3-High UPS-64 – 47.8" x 12" x 33.5" (121.5 x 30 x 85 cm) 619 lb (281 kg)

Output Connections

Terminal block (Hardwired)

Operating Temperature

50–104ºF (10–40ºC), 45ºC with 7.5% derating; Optimal battery performance: 77ºF (25ºC)

Operating Elevation

9,843 ft (3,000m) operating without derating 32,810 ft (10,000m) during transportation

Acoustic Noise

<56 dBA at 1 meter distance, typical loads<62 dBA for heavy load, high ambient or high altitude, on battery


EMC COMPLIANCE 47 CFR Part 15/ICES-003 Class A
Quality ISO 9001:2015, ISO 14001:2004
SAFETY CERTIFICATIONS UL1778 5th Edition, CSA C22.2 No. 107.3-14, NOM-NYCE
SURGE ANSI C62.41 Category B3, IEC 61000-4-5


(1) RS-232, (1) relay contact, (1) REPO, (2) environmental input
COMMUNICATION SLOTS (2) X-Slot communication bays


1-Year parts, (90) days onsite labor from startup

Available Options

External maintenance bypass, output distribution, external battery packs, parallel cables

Estimated Run-Time

Battery Run Time Chart: